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Do you have a guess? >The unusual feature of this module is the encapsulated module in the upper left. This module appears to contain three transistors and fiv
by mzs 4y ago
Do you have a guess?
>The unusual feature of this module is the encapsulated module in the upper left. This module appears to contain three transistors and five capacitors. It's unclear why these components are encased in plastic. The block diagram for this module doesn't show any special circuitry that would motivate encapsulation. I hope to reverse-engineer this module to figure this out.
- jmole 4y agotemperature consistency across all the parts, probably. It's the reason things like discrete current sources use dual transistor packages: important transistor parameters track strongly with temperature, and if you want them to match, the temperatures need to be the same.
- atoav 4y agoI'd also say thermal coupling to ensure these components drift with some common average temperature. One thing where this would be done is e.g. an exponential converter or an antilog-amplifier, although there one would need only two transistors (one PNP and one NPN).